Got a stripped out gti (today, -100kg) that i'll be upgrading the suspension on during the long dark Swedish winter. The front will get a set of D2 racing coilovers (comes with adjustable rear dampers)
The question i have is, which torsion bars should i get? the alternatives I've found are 21 (off of a xsara VTS) 23,5 and 25,5mm.
I know about the massive increase in stiffness with increased diameter but i dont know what to pick!
The car is only used for trackdays basically, i do still drive it to the track but i think i can live with a bumpy ride
What should i get?

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Peugeot 306 GTI -97 Stripped out trackday toy
Peugeot 307 SW Griffe -05
Peugeot 206 1,6 Griffe -04